Genuine Mazda Front Brake Disc Retaining Screw • 99831-0816

Genuine Mazda Front Brake Disc Retaining Screw

Replacement Genuine Mazda front brake-disc retaining screw for all Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models with 1.8- or 2.0-litre petrol engines.

This screw passes through the front brake disc and threads into the wheel hub, holding the disc in its correct position while the brake and wheel assemblies are installed or removed.

Two retaining screws are fitted to each front brake disc. With one disc on each side of the vehicle, four screws are used across the complete front axle.

The retaining screws assist with disc positioning during assembly and servicing. Once the wheel is installed, the brake disc is principally clamped against the hub by the wheel and wheel nuts.

This listing supplies one Genuine Mazda screw. Order two screws for one front brake disc or four screws when replacing all front disc-retaining screws.

• Part type: Brake-disc retaining screw
• Common names: Brake rotor screw / disc-to-hub screw / locating screw
• Mazda catalogue description: Screw
• Installation area: Front brake and wheel hub assembly
• Installation position: Between the front brake disc and wheel hub
• Side application: Left or right
• Quantity fitted per front brake disc: 2
• Quantity fitted per vehicle: 4
• Quantity supplied: 1 screw
• Front brake disc included: No
• Wheel hub included: No
• Brake caliper included: No
• Brand: Genuine Mazda
• Part No.: 99831-0816
• Compact reference: 998310816
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC

Typical reasons for replacement:

• Original screw seized through corrosion
• Screw head rounded or damaged during removal
• Threads corroded, stripped or cross-threaded
• Original screw drilled out during brake-disc replacement
• Screw missing following previous brake work
• Front brake discs or wheel hubs being replaced
• Incorrect non-standard screw previously installed

Quantity advice: Two screws are used on each front brake disc. This listing supplies one screw; order two for one front disc or four for both sides.

Fitment advice: This screw is used on the front brake discs of the MX-5 NC. Confirm the installation position before ordering, as similar retaining screws are used on other Mazda brake assemblies.

Removal advice: Corrosion can cause the original screw to seize in the wheel hub. Use a correctly fitting driver bit and apply firm axial pressure to reduce the risk of damaging the screw head.

Hub inspection: Clean the brake-disc mounting face and inspect the threaded holes in the hub. Corrosion or debris between the disc and hub can prevent the disc from seating squarely and may contribute to brake vibration.

Installation advice: Start the screw by hand to prevent cross-threading. Tighten only using the applicable Mazda procedure; overtightening can damage the screw head or hub threads.

Brake-disc advice: The retaining screws position the disc during assembly but do not replace the clamping force provided by the correctly installed wheel and wheel nuts.

Other items to inspect: Check the front brake discs, pads, calipers, backing plates, wheel hubs and the remaining retaining screws while the brake assembly is dismantled.

Useful tools / consumables: Correct-size driver bit, hand-impact driver where required, penetrating fluid, small wire brush, brake cleaner and a calibrated torque wrench for the surrounding brake and wheel fasteners.

Difficulty guide: DIY Difficulty: Easy where the original screw remains free. A heavily corroded or rounded screw may require an impact driver, drilling or extraction equipment.

Why Genuine Mazda? Genuine Mazda retaining screws match the original thread, head profile and brake-disc mounting arrangement. Correctly fitting hardware reduces the risk of thread damage and helps keep the disc positioned during servicing.

What’s in the box: One Genuine Mazda front brake-disc retaining screw, part number 99831-0816.

Installation notes: Raise and support the vehicle safely, remove the wheel and access the front brake disc. Remove the original retaining screw using the correct driver. Clean the hub mounting face and threaded hole, then position the brake disc squarely against the hub. Start the replacement screw by hand and tighten it using the applicable Mazda procedure. Reassemble the brakes and wheel, then confirm correct operation before road use.